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libnvdimm, region: Fail badblocks listing for inactive regions

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commit 5d394eee2c upstream.

While experimenting with region driver loading the following backtrace
was triggered:

 INFO: trying to register non-static key.
 the code is fine but needs lockdep annotation.
 turning off the locking correctness validator.
 [..]
 Call Trace:
  dump_stack+0x85/0xcb
  register_lock_class+0x571/0x580
  ? __lock_acquire+0x2ba/0x1310
  ? kernfs_seq_start+0x2a/0x80
  __lock_acquire+0xd4/0x1310
  ? dev_attr_show+0x1c/0x50
  ? __lock_acquire+0x2ba/0x1310
  ? kernfs_seq_start+0x2a/0x80
  ? lock_acquire+0x9e/0x1a0
  lock_acquire+0x9e/0x1a0
  ? dev_attr_show+0x1c/0x50
  badblocks_show+0x70/0x190
  ? dev_attr_show+0x1c/0x50
  dev_attr_show+0x1c/0x50

This results from a missing successful call to devm_init_badblocks()
from nd_region_probe(). Block attempts to show badblocks while the
region is not enabled.

Fixes: 6a6bef9042 ("libnvdimm: add mechanism to publish badblocks...")
Cc: <stable@vger.kernel.org>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Williams
2018-09-27 15:01:55 -07:00
committed by Greg Kroah-Hartman
parent 1490de2bb0
commit 75c7ba4853
1 changed files with 9 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/nvdimm/region_devs.c
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@@ -513,10 +513,17 @@ static ssize_t region_badblocks_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct nd_region *nd_region = to_nd_region(dev);
ssize_t rc;
return badblocks_show(&nd_region->bb, buf, 0);
device_lock(dev);
if (dev->driver)
rc = badblocks_show(&nd_region->bb, buf, 0);
else
rc = -ENXIO;
device_unlock(dev);
return rc;
}
static DEVICE_ATTR(badblocks, 0444, region_badblocks_show, NULL);
static ssize_t resource_show(struct device *dev,